Measurement of the spin-wave specific heat of antiferromagnetic CoCl<sub>2</sub>6H<sub>2</sub>O and NiCl<sub>2</sub>6H<sub>2</sub>O
R H Donaldson; D T Edmonds; R H Donaldson; Clarendon Laboratory, Oxford; D T Edmonds; Clarendon Laboratory, Oxford
Журнал:
Proceedings of the Physical Society
Дата:
1965-06-01
Аннотация:
Measurement of the spin-wave specific heat of two antiferromagnetic salts CoCl<sub>2</sub>6H<sub>2</sub>O and NiCl<sub>2</sub>6H<sub>2</sub>O is reported in the temperature range 0.7 °K to 4.0 °K. The temperature dependence of the specific heat of both salts is that which would be predicted by spin-wave theory were the energy gap in the spin-wave dispersion relation less than or equal to approximately half the value obtained by antiferromagnetic resonance. The presence of states within the spin-wave energy gap is discussed.
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